== main ==
fun main() {
    while(1 > 0) {
      2
    }
}
---------------------
L0:
    <START>                       NEXT:[r(while(1 > 0) { 2 }) ]        PREV:[]
    r(while(1 > 0) {          
          2                   
        })                        NEXT:[r(1)]                          PREV:[<START>]
L2 [loop entry point]:
L5 [condition entry point]:
    r(1)                          NEXT:[r(0)]                          PREV:[r(while(1 > 0) { 2 }) , jmp(L2 [loop entry point])]
    r(0)                          NEXT:[r(>)]                          PREV:[r(1)]
    r(>)                          NEXT:[r(1 > 0)]                      PREV:[r(0)]
    r(1 > 0)                      NEXT:[jf(L3 [loop exit point])]      PREV:[r(>)]
    jf(L3 [loop exit point])      NEXT:[read (Unit), r(2)]             PREV:[r(1 > 0)]
L4 [body entry point]:
    r(2)                          NEXT:[jmp(L2 [loop entry point])]    PREV:[jf(L3 [loop exit point])]
    jmp(L2 [loop entry point])    NEXT:[r(1)]                          PREV:[r(2)]
L3 [loop exit point]:
    read (Unit)                   NEXT:[<END>]                         PREV:[jf(L3 [loop exit point])]
L1:
    <END>                         NEXT:[<SINK>]                        PREV:[read (Unit)]
error:
    <ERROR>                       NEXT:[<SINK>]                        PREV:[]
sink:
    <SINK>                        NEXT:[]                              PREV:[<ERROR>, <END>]
=====================
== dowhile ==
fun dowhile() {
    do {return}
    while(1 > 0)
}
---------------------
L0:
    <START>                      NEXT:[r(do {return} while(1 > 0)) ]    PREV:[]
    r(do {return}            
        while(1 > 0))            NEXT:[ret L1]                          PREV:[<START>]
L2 [loop entry point]:
L4 [body entry point]:
    ret L1                       NEXT:[<END>]                           PREV:[r(do {return} while(1 > 0)) ]
L5 [condition entry point]:
-   r(1)                         NEXT:[r(0)]                            PREV:[]
-   r(0)                         NEXT:[r(>)]                            PREV:[]
-   r(>)                         NEXT:[r(1 > 0)]                        PREV:[]
-   r(1 > 0)                     NEXT:[jt(L2 [loop entry point])]       PREV:[]
-   jt(L2 [loop entry point])    NEXT:[read (Unit), ret L1]             PREV:[]
L3 [loop exit point]:
-   read (Unit)                  NEXT:[<END>]                           PREV:[]
L1:
    <END>                        NEXT:[<SINK>]                          PREV:[ret L1]
error:
    <ERROR>                      NEXT:[<SINK>]                          PREV:[]
sink:
    <SINK>                       NEXT:[]                                PREV:[<ERROR>, <END>]
=====================